EP0462955A1 - Improved tools for cutting rock drilling - Google Patents

Improved tools for cutting rock drilling Download PDF

Info

Publication number
EP0462955A1
EP0462955A1 EP91850163A EP91850163A EP0462955A1 EP 0462955 A1 EP0462955 A1 EP 0462955A1 EP 91850163 A EP91850163 A EP 91850163A EP 91850163 A EP91850163 A EP 91850163A EP 0462955 A1 EP0462955 A1 EP 0462955A1
Authority
EP
European Patent Office
Prior art keywords
diamond
cemented carbide
phase
cbn
eta
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91850163A
Other languages
German (de)
French (fr)
Other versions
EP0462955B1 (en
Inventor
Mats Waldenström
Udo Fischer
Lars Hillert
Mahlon Dennis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diamant Boart Stratabit SA
Sandvik AB
Original Assignee
Diamant Boart Stratabit SA
Sandvik AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diamant Boart Stratabit SA, Sandvik AB filed Critical Diamant Boart Stratabit SA
Publication of EP0462955A1 publication Critical patent/EP0462955A1/en
Application granted granted Critical
Publication of EP0462955B1 publication Critical patent/EP0462955B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts
    • E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
    • E21B10/573—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element
    • E21B10/5735—Interface between the substrate and the cutting element
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide

Definitions

  • the present invention concerns the field of drill bits and inserts therefor. More particularly the invention relates to drill bit inserts for cutting rock.
  • the inserts comprise cemented carbide provided with bodies and/or layers of diamond and/or cubic boron nitride (cBN).
  • a rock bit generally consists of a body of steel which is provided with a number of inserts comprising cemented carbide. Many different types of such rock bits exist having different shapes of the body of steel and of the inserts of cemented carbide as well as different numbers and grades of the inserts.
  • the inserts For percussive and rotary crushing rock drilling the inserts generally have a rounded shape, often of a cylinder with a rounded top surface generally referred to as a button.
  • the inserts are provided with an edge acting as a cutter.
  • thermo resistant abrasive polycrystalline diamond bodies having different additions of binder metals at different distances from the working surface.
  • a recent development in this field is the use of one or more continuous layers of polycrystalline diamond on the top surface of the cemented carbide button.
  • US Patent 4,811,801 discloses rock bit buttons including such a polycrystalline diamond surface on top of the cemented carbide buttons having a Young's modulus of elasticity between 80 and 102 x 106 p.s.i., a coefficient of thermal expansion between 2,5 and 3,4 x 10 ⁇ 6 °C ⁇ 1,a hardness between 88,1 and 91,1 HRA and a coercivity between 85 and 160 Oe.
  • Another development is disclosed in US Patent 4,592,433 including a cutting blank for use on a drill bit comprising a substrate of a hard material having a cutting surface with strips of polycrystalline diamond dispersed in grooves, arranged in various patterns.
  • US Patent 4,784,023 discloses a cutting element comprising a stud and a composite bonded thereto.
  • the composite comprises a substrate formed of cemented carbide and a diamond layer bonded to the substrate.
  • the interface between the diamond layer and the substrate is defined by alternating ridges of diamond and cemented carbide which are mutually interlocked.
  • the top surface of the diamond body is continuous-and covering the whole insert. The sides of the diamond body are not in direct contact with any cemented carbide.
  • US Patent 4,743,515 discloses rock bit buttons of cemented, carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt closer to the eta-phase zone.
  • the object of the invention is to provide a drill bit cutter of cemented carbide with bodies and/or layers of diamond and/ or cBN with high and uniform compression of the diamond or cBN by sintering at high pressure and high temperature in the diamond or cBN stable area.
  • a drill bit insert for cutting rock comprising a body of cemented carbide according to US Patent 4,743,515 provided with one or more bodies and/or a layer of diamond and/or cBN and produced at high pressure and high temperature.
  • the cutter above can be adapted to different types of rocks by changing the material properties and geometries of the cemented carbide and/or the diamond or cBN, especially hardness, elasticity and thermal expansion, giving different wear resistance and impact strength of the bits.
  • Hammer impact tests of inserts of the type described in US Patent 4,784,023 with a substrate of cemented carbide and a diamond layer bonded to the substrate (FIG.1) revealed a tendency of chipping off part of the diamond layer after a number of blows.
  • FIG.2 shows a cemented carbide insert according to the invention having the same type of layer of diamond as in FIG.1 but with the cemented carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.
  • FIG.3-30 show various embodiments of cemented carbide according to the invention, i.e. provided with different bodies of diamond or cBN in the surface.
  • the inserts according to FIG.5-30 can also be provided with at least one layer of diamond and/or cBN partly or completely covering the insert.
  • the core of the cemented carbide insert is in all cases containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.
  • the strips may be non-intersecting or could be interconnected such as at their ends to form an undulating pattern, or chevrons for example.
  • An outer curvilinear strip may interconnect outer ends of other strips to form an extended cutting edge for use in softer formation.
  • the strips may comprise two sets of strips, with each set extending toward a different section of the peripheral edge; the strips of one set may be spaced from the strips of the other set by a central region of the cutting surface.
  • the bodies of diamond and/or cBN may be placed regularly or irregularly on the top of the insert. Different sizes and shapes of the bodies may be mixed. Other modifications, too, are obvious to those skilled in the art.
  • the diamond or cBN may be thermally stable or thermally unstable.
  • the diamond and/or cBN can be sinterd in place in grooves, for example.
  • the grooves may have a depth in the range from 0,2-3,5 mm and a width in the range of from 0,2-4,0 mm.
  • the grooves may include undercut portions to promote stability of the diamond or cBN strips.
  • the cutting insert is preferably brazed to a holder, such as a cemented carbide stud, and the stud is preferably press-fit into a drill-bit. However, brazing is often sufficient.
  • the diamond or cBN bodies or layers shall be adapted to the type of rock and drilling method by varying the grain size of the diamond or cBN feed stock and the amount of binder metal.
  • hard materials preferably less than 50 vol.%, can be added such as : diamond, cBN, B4C, TiB2, SiC, ZrC, WC, TiN, ZrB, ZrN, TiC, (Ta,Nb)C, Cr-carbides, AlN, Si3N4, AlB2.etc. as well as whiskers of B4C, SiC, TiN, Si3N4, etc. (See US Patent 4,766,040).
  • the bodies of diamond or cBN may have different levels of catalyst metal at different distances from the working surface according to US Patent 4,766,040.
  • the cemented carbide grade shall be chosen with respect to type of rock and drilling methods. It is important to chose a grade which has a suitable wear resistance compared to that of the diamond or cBN body or coating.
  • the catalyst phase content shall be 3-35 weight %, preferably 5-25 weight % for cutting rock drilling cutters and the grain size of the cemented carbide at least 1 micrometer, preferably 2-6 micrometer.
  • the cemented carbide insert shall have a core containing eta-phase.
  • the size of this core shall be 10-95%, preferably 30-65% of the total amount of cemented carbide in the insert.
  • the core should contain at least 2% by volume, preferably at least 10% by volume of eta-phase but at most 60% by volume, preferably at the most 35% by volume.
  • the content of binder phase i.e. in general the content of cobalt,shall in the surface be 0,1-0,9, preferably 0,2-0,7 of the nominal content of binder phase and the binder phase content shall increase in the direction towards the core up to a maximum of at least 1,2, preferably 1,4-2,5 of the nominal content of binder phase.
  • the width of the zone poor of binder phase shall be 0,2-0,8, preferably 0,3-0,7 of the width of the zone free of eta-phase, but at least 0,4 mm and preferably at least 0,8 mm in width.
  • the bodies of polycrystalline diamond may extend a shorter or longer distance into the cemented carbide body and the diamond or cBN body can be in contact with all three described zones, preferably in contact only with the cobalt poor zone.
  • the diamond or cBN bodies consist of prefabricated and sintered bodies in which the catalyst metal has been extracted by acids.
  • the bodies or layers are attached by the HP/HT technique.
  • HP/HT high/HT technique
  • the HP/HT technique give a favourable stress distribution and a better thermal stability because of the absence of binder metal in the diamond or cBN.
  • the cemented carbide inserts are manufacturated by powder metallurgical methods according to US Patent 4,743,515.
  • the holes for the diamond or cBN bodies are preferably made before sintering either in a separate operation or by compacting in a specially designed tool.
  • the mixture of diamond or cBN powder, catalyst metal and other ingredients are put in the holes or on the surface of the cemented carbide body, enclosed in thin foils and sintered at high pressure, more than 3,5 GPa, preferably at 6-7 GPa and at a temperature of more than 1100°C, preferably 1700°C for 1-30 minutes, preferably about 3 minutes.
  • the content of binder metal in the diamond or cBN body or layer may be controlled either by previously coating the insert with a thin layer of e.g. TiN by CVD- or PVD-methods or by using thin foils such as Mo as disclosed in US Patent 4,764,434.
  • the insert After high-pressure sintering the insert is blasted and ground to final shape and dimension.
  • a hammer impact test was made using a modified Charpy pendulum of diamond inserts according to FIG.2 with and FIG.1 without eta-phase core.
  • the diamond layer had a thickness of 0,7 mm.
  • the total height of the inserts was 3,5 mm and the diameter 13,3 mm.
  • the hammer was released from a certain height and the chipping was observed after each blow. The number of blows before chipping was taken as the measure of the shock resistance.
  • Example 1 was repeated but with a cBN instead of a diamond coating with the difference that the hammer was released from another height.

Abstract

The present invention relates to a rock bit insert of cemented carbide for cutting rock drilling.
The insert (1) is provided with one or more bodies (3) or layers of diamond or cBN produced at high pressure and high temperature in the diamond or cBN stable area.
The body ef cemented carbide has a multi-structure containing eta-phase (6) surrounded by a surface zone (4,5) of cemented carbide free of eta-phase and having a low content of cobalt in the surface (4) and a higher content of cobalt next to the eta-phase zone (5).

Description

    FIELD OF THE INVENTION
  • The present invention concerns the field of drill bits and inserts therefor. More particularly the invention relates to drill bit inserts for cutting rock. The inserts comprise cemented carbide provided with bodies and/or layers of diamond and/or cubic boron nitride (cBN).
    • BACKGROUND OF THE INVENTION
  • There are three main groups of rock drilling methods: percussive, rotary crushing and cutting.
  • In percussive and rotary crushing rock drilling the bit buttons are working as rock crushing tools as opposed to cutting, where the inserts work rather as shearing elements. A rock bit generally consists of a body of steel which is provided with a number of inserts comprising cemented carbide. Many different types of such rock bits exist having different shapes of the body of steel and of the inserts of cemented carbide as well as different numbers and grades of the inserts.
  • For percussive and rotary crushing rock drilling the inserts generally have a rounded shape, often of a cylinder with a rounded top surface generally referred to as a button.
  • For shearing rock the inserts are provided with an edge acting as a cutter.
  • There already exists a number of different high pressure-high temperature sintered cutters provided with polycrystalline diamond layers. These high wear resistant cutter tools are mainly used for oil drilling.
  • The technique when producing such polycrystalline diamond tools using high pressure-high temperature (HP/HT) has been described in a number of patents, e.g.: US Patent No 2,941,248: "High temperature high pressure apparatus". US Patent No 3,141,746: "Diamond compact abrasive": High pressure bonded body having more than 50 vol% diamond and a metal binder:Co,Ni,Ti,Cr,Mn,Ta etc.
  • These patents disclose the use of a pressure and a temperature where diamond is the stable phase.
  • In some later patents: e.g. US Patent Nos 4,764,434 and 4,766,040 high pressure-high temperature sintered polycrystalline diamond tools are described. In the first patent the diamond layer is bonded to a support body having a complex, non-plane geometry by means of a thin layer of a refractory material applied by PVD or CVD technique.
  • In the second patent temperature resistant abrasive polycrystalline diamond bodies are described having different additions of binder metals at different distances from the working surface.
  • A recent development in this field is the use of one or more continuous layers of polycrystalline diamond on the top surface of the cemented carbide button.
  • US Patent 4,811,801 discloses rock bit buttons including such a polycrystalline diamond surface on top of the cemented carbide buttons having a Young's modulus of elasticity between 80 and 102 x 10⁶ p.s.i., a coefficient of thermal expansion between 2,5 and 3,4 x 10⁻⁶ °C⁻¹,a hardness between 88,1 and 91,1 HRA and a coercivity between 85 and 160 Oe. Another development is disclosed in US Patent 4,592,433 including a cutting blank for use on a drill bit comprising a substrate of a hard material having a cutting surface with strips of polycrystalline diamond dispersed in grooves, arranged in various patterns.
  • US Patent 4,784,023 discloses a cutting element comprising a stud and a composite bonded thereto.
  • The composite comprises a substrate formed of cemented carbide and a diamond layer bonded to the substrate. The interface between the diamond layer and the substrate is defined by alternating ridges of diamond and cemented carbide which are mutually interlocked. The top surface of the diamond body is continuous-and covering the whole insert. The sides of the diamond body are not in direct contact with any cemented carbide.
  • European patent application 0312281 discloses a tool insert comprising a body of cemented carbide with a layer of polycrystalline diamond and between the layer and the cemented carbide a number of recesses filled with abrasive compact material extending into the supporting body of cemented carbide.
  • Another development in this field is the use of cemented carbide bodies having different structures in different distances from the surface.
  • US Patent 4,743,515 discloses rock bit buttons of cemented, carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt closer to the eta-phase zone.
  • US Patent 4,820,482 discloses rock bit buttons of cemented carbide having a content of binder phase in the surface that is lower and in the center higher than the nominal content. In the center there is a zone having a uniform content of binder phase. The tungsten carbide grain size is uniform throughout the body.
    • OBJECT OF THE INVENTION
  • The object of the invention is to provide a drill bit cutter of cemented carbide with bodies and/or layers of diamond and/ or cBN with high and uniform compression of the diamond or cBN by sintering at high pressure and high temperature in the diamond or cBN stable area.
  • It is a further object of the invention to make it possible to maximize the effect of diamond or cBN on the resistance to cracking, chipping and wear.
    • SUMMARY OF THE INVENTION
  • According to the present invention there is provided a drill bit insert for cutting rock comprising a body of cemented carbide according to US Patent 4,743,515 provided with one or more bodies and/or a layer of diamond and/or cBN and produced at high pressure and high temperature. The cutter above can be adapted to different types of rocks by changing the material properties and geometries of the cemented carbide and/or the diamond or cBN, especially hardness, elasticity and thermal expansion, giving different wear resistance and impact strength of the bits. Hammer impact tests of inserts of the type described in US Patent 4,784,023 with a substrate of cemented carbide and a diamond layer bonded to the substrate (FIG.1) revealed a tendency of chipping off part of the diamond layer after a number of blows.
  • When using a cemented carbine body having a multi-structure according to US Patent 4,743,515 with a diamond layer (FIG.2) it was surprisingly found that the chipping off tendency of the diamond layer considerably decreased compared to the corresponding geometry and composition without the multi-structure carbide (FIG.1).
  • A similar improvement was achieved for inserts having a layer of cBN and comparing cemented carbide bodies with and without a multi-structure according to US Patent 4,743,515. The explanation of this effect,is that the increase of the resistance against chipping, might give a favourable stress pattern caused by the difference between the thermal expansion of the diamond layer and the cemented carbide body, giving the layer a high and uniform compressive prestress.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • 1 = cemented carbide insert
    2 = steel body
    3 = diamond or cBN body
    4 - cemented carbide : Co poor zone
    5 = cemented carbide : Co rich zone
    6 = cemented carbide : eta-phase containing core
  • FIG.1 shows a prior art cemented carbide insert having a layer of polycrystalline diamond.
  • FIG.2 shows a cemented carbide insert according to the invention having the same type of layer of diamond as in FIG.1 but with the cemented carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.
  • FIG.3-30 show various embodiments of cemented carbide according to the invention, i.e. provided with different bodies of diamond or cBN in the surface. The inserts according to FIG.5-30 can also be provided with at least one layer of diamond and/or cBN partly or completely covering the insert. The core of the cemented carbide insert is in all cases containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.
    • DETAILED DESCRIPTION OF THE INVENTION.
  • The rock cutter according to the present invention is provided with one or more bodies and/or a coating of one or more layers of diamond and/or cBN. The coating can have different shapes such as a completely covering layer on top of the insert of cemented carbide or strips of different shapes and patterns on top of the cemented carbide insert. Each strip includes a working face exposed at the surface of the cemented carbide insert. The strips may extend toward a peripheral edge of the insert and may terminate short of such edge or extend all the way thereto.
  • The strips may be non-intersecting or could be interconnected such as at their ends to form an undulating pattern, or chevrons for example. An outer curvilinear strip may interconnect outer ends of other strips to form an extended cutting edge for use in softer formation. The strips may comprise two sets of strips, with each set extending toward a different section of the peripheral edge; the strips of one set may be spaced from the strips of the other set by a central region of the cutting surface.
  • The bodies of diamond and/or cBN may be placed regularly or irregularly on the top of the insert. Different sizes and shapes of the bodies may be mixed. Other modifications, too, are obvious to those skilled in the art.
  • The diamond or cBN may be thermally stable or thermally unstable.
  • The diamond and/or cBN can be sinterd in place in grooves, for example.
  • The grooves may have a depth in the range from 0,2-3,5 mm and a width in the range of from 0,2-4,0 mm. The grooves may include undercut portions to promote stability of the diamond or cBN strips. The cutting insert is preferably brazed to a holder, such as a cemented carbide stud, and the stud is preferably press-fit into a drill-bit. However, brazing is often sufficient.
  • The diamond or cBN bodies or layers shall be adapted to the type of rock and drilling method by varying the grain size of the diamond or cBN feed stock and the amount of binder metal.
  • The grain size of the diamond or cBN shall be 3-500 micrometer, preferably 10-150 micrometer. The diamond or cBN may be only one nominal grain size or consist of a mixture of sizes, such as 80 w/o of 40 micrometer and 20 w/o of 10 micrometer. Different types of catalyst metals can be used such as Co,Ni,Mo,Ti,Zr,W,Si,Ta,Fe,Cr,Al,Mg,Cu etc. or alloys between them. The amount of catalyst metal shall be 1-40 vol.%, preferably 3-20 vol.%.
  • In addition other hard materials, preferably less than 50 vol.%, can be added such as : diamond, cBN, B₄C, TiB₂, SiC, ZrC, WC, TiN, ZrB, ZrN, TiC, (Ta,Nb)C, Cr-carbides, AlN, Si₃N₄, AlB₂.etc. as well as whiskers of B₄C, SiC, TiN, Si₃N₄, etc. (See US Patent 4,766,040).
  • The bodies of diamond or cBN may have different levels of catalyst metal at different distances from the working surface according to US Patent 4,766,040.
  • The cemented carbide grade shall be chosen with respect to type of rock and drilling methods. It is important to chose a grade which has a suitable wear resistance compared to that of the diamond or cBN body or coating. The catalyst phase content shall be 3-35 weight %, preferably 5-25 weight % for cutting rock drilling cutters and the grain size of the cemented carbide at least 1 micrometer, preferably 2-6 micrometer.
  • The cemented carbide insert shall have a core containing eta-phase. The size of this core shall be 10-95%, preferably 30-65% of the total amount of cemented carbide in the insert.
  • The core should contain at least 2% by volume, preferably at least 10% by volume of eta-phase but at most 60% by volume, preferably at the most 35% by volume.
  • In the zone free of eta-phase the content of binder phase, i.e. in general the content of cobalt,shall in the surface be 0,1-0,9, preferably 0,2-0,7 of the nominal content of binder phase and the binder phase content shall increase in the direction towards the core up to a maximum of at least 1,2, preferably 1,4-2,5 of the nominal content of binder phase. The width of the zone poor of binder phase shall be 0,2-0,8, preferably 0,3-0,7 of the width of the zone free of eta-phase, but at least 0,4 mm and preferably at least 0,8 mm in width.
  • The bodies of polycrystalline diamond may extend a shorter or longer distance into the cemented carbide body and the diamond or cBN body can be in contact with all three described zones, preferably in contact only with the cobalt poor zone.
  • In one embodiment the diamond or cBN bodies consist of prefabricated and sintered bodies in which the catalyst metal has been extracted by acids.
  • The bodies or layers are attached by the HP/HT technique.
  • The HP/HT technique give a favourable stress distribution and a better thermal stability because of the absence of binder metal in the diamond or cBN.
  • The cemented carbide inserts are manufacturated by powder metallurgical methods according to US Patent 4,743,515. The holes for the diamond or cBN bodies are preferably made before sintering either in a separate operation or by compacting in a specially designed tool.
  • After sintering of the cemented carbide the mixture of diamond or cBN powder, catalyst metal and other ingredients are put in the holes or on the surface of the cemented carbide body, enclosed in thin foils and sintered at high pressure, more than 3,5 GPa, preferably at 6-7 GPa and at a temperature of more than 1100°C, preferably 1700°C for 1-30 minutes, preferably about 3 minutes.
  • The content of binder metal in the diamond or cBN body or layer may be controlled either by previously coating the insert with a thin layer of e.g. TiN by CVD- or PVD-methods or by using thin foils such as Mo as disclosed in US Patent 4,764,434.
  • After high-pressure sintering the insert is blasted and ground to final shape and dimension.
    • EXAMPLE 1 DIAMOND
  • A hammer impact test was made using a modified Charpy pendulum of diamond inserts according to FIG.2 with and FIG.1 without eta-phase core. The diamond layer had a thickness of 0,7 mm. The total height of the inserts was 3,5 mm and the diameter 13,3 mm.
  • The hammer was released from a certain height and the chipping was observed after each blow. The number of blows before chipping was taken as the measure of the shock resistance.
    • RESULTS
  • Figure imgb0001
    • EXAMPLE 2 cBN
  • Example 1 was repeated but with a cBN instead of a diamond coating with the difference that the hammer was released from another height.
    • RESULTS
  • Figure imgb0002

Claims (5)

  1. Cemented carbide rock cutter for cutting rock drilling having bodies and/or one or more layers of diamond and/or cBN bonded at high pressure and high temperature characterized in that the insert has a multiphase structure with a core containing eta-phase surrounded by a surface zone free of eta-phase.
  2. Rock cutter according to claim 1 characterized in that the binder phase content in a zone close to the eta-phase containing core is higher than the nominal binder phase content.
  3. Rock cutter according to any of the preceding claims characterized in that the binder phase content in the surface of said insert is 0,1-0,9 of the nominal binder phase content.
  4. Rock cutter according to any of the preceding claims whereby the shape has similarly to the shapes shown in Figures 1-30, but not exclusively these shapes which are only meant as examples.
  5. Rock cutter according to any of the preceding claims whereby the grain size of the hard phase is preferably 80 vol-% of 40 micrometer and 20 vol-% of 10 micrometer material.
EP91850163A 1990-06-15 1991-06-12 Improved tools for cutting rock drilling Expired - Lifetime EP0462955B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002137A SE9002137D0 (en) 1990-06-15 1990-06-15 IMPROVED TOOLS FOR CUTTING ROCK DRILLING
SE9002137 1990-06-15

Publications (2)

Publication Number Publication Date
EP0462955A1 true EP0462955A1 (en) 1991-12-27
EP0462955B1 EP0462955B1 (en) 1995-12-27

Family

ID=20379781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91850163A Expired - Lifetime EP0462955B1 (en) 1990-06-15 1991-06-12 Improved tools for cutting rock drilling

Country Status (7)

Country Link
US (1) US5217081A (en)
EP (1) EP0462955B1 (en)
DE (1) DE69115766T2 (en)
IE (1) IE71946B1 (en)
NO (1) NO180691C (en)
SE (1) SE9002137D0 (en)
ZA (1) ZA914394B (en)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0542704A1 (en) * 1991-11-13 1993-05-19 Sandvik Aktiebolag Cemented carbide body with increased wear resistance
GB2261894A (en) * 1991-11-30 1993-06-02 Camco Drilling Group Ltd Improvements in or relating to cutting elements for rotary drill bits
EP0592210A2 (en) * 1992-10-07 1994-04-13 Camco Drilling Group Limited Cutting element for rotary drag drillbit
EP0601840A1 (en) * 1992-12-10 1994-06-15 Camco Drilling Group Limited Improvements in or relating to cutting elements for rotary drill bits
EP0604211A1 (en) * 1992-12-23 1994-06-29 De Beers Industrial Diamond Division (Proprietary) Limited Composite tool for drilling bits
GB2275068A (en) * 1993-02-10 1994-08-17 Baker Hughes Inc Polycrystalline diamond cutting element
GB2281087A (en) * 1993-08-17 1995-02-22 Dennis Mahlon Denton Cutting element for drill bits
EP0655548A1 (en) * 1993-11-10 1995-05-31 Camco Drilling Group Limited Improvements in or relating to cutting elements for rotary drill bits
EP0692607A3 (en) * 1994-06-16 1997-09-10 De Beers Ind Diamond Tool component with abrasive compact
GB2316698A (en) * 1996-08-26 1998-03-04 Smith International PDC compact for cutter element having contoured substrate interface
EP0716215A3 (en) * 1994-12-09 1998-03-18 Baker Hughes Incorporated Superhard cutting structures for earth boring with enhanced stiffness and heat transfer capabilities
US5906246A (en) * 1996-06-13 1999-05-25 Smith International, Inc. PDC cutter element having improved substrate configuration
EP0989282A2 (en) * 1998-09-24 2000-03-29 Camco International (UK) Limited Improvements in preform cutting elements for rotary drag-type drill bits
US6148937A (en) * 1996-06-13 2000-11-21 Smith International, Inc. PDC cutter element having improved substrate configuration
US6325165B1 (en) * 1998-03-06 2001-12-04 Smith International, Inc. Cutting element with improved polycrystalline material toughness
US6435058B1 (en) 2000-09-20 2002-08-20 Camco International (Uk) Limited Rotary drill bit design method
WO2004040095A1 (en) * 2002-10-30 2004-05-13 Element Six (Proprietary) Limited Tool insert
WO2007069029A1 (en) * 2005-12-12 2007-06-21 Element Six (Production) (Pty) Ltd Pcbn cutting tool components
US7594553B2 (en) * 2002-10-30 2009-09-29 Klaus Tank Composite tool insert
WO2011090582A1 (en) * 2010-01-21 2011-07-28 Us Synthetic Corporation Polycrystalline diamond compacts, method of fabricating same, and various applications
US8020645B2 (en) 2008-10-03 2011-09-20 Us Synthetic Corporation Method of fabricating polycrystalline diamond and a polycrystalline diamond compact
US8727046B2 (en) 2011-04-15 2014-05-20 Us Synthetic Corporation Polycrystalline diamond compacts including at least one transition layer and methods for stress management in polycrsystalline diamond compacts
US8741010B2 (en) 2011-04-28 2014-06-03 Robert Frushour Method for making low stress PDC
US8828110B2 (en) 2011-05-20 2014-09-09 Robert Frushour ADNR composite
US8858665B2 (en) 2011-04-28 2014-10-14 Robert Frushour Method for making fine diamond PDC
US8974559B2 (en) 2011-05-12 2015-03-10 Robert Frushour PDC made with low melting point catalyst
US9061264B2 (en) 2011-05-19 2015-06-23 Robert H. Frushour High abrasion low stress PDC
US9315881B2 (en) 2008-10-03 2016-04-19 Us Synthetic Corporation Polycrystalline diamond, polycrystalline diamond compacts, methods of making same, and applications
US9428967B2 (en) 2013-03-01 2016-08-30 Baker Hughes Incorporated Polycrystalline compact tables for cutting elements and methods of fabrication

Families Citing this family (94)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9003251D0 (en) * 1990-10-11 1990-10-11 Diamant Boart Stratabit Sa IMPROVED TOOLS FOR ROCK DRILLING, METAL CUTTING AND WEAR PART APPLICATIONS
US5417475A (en) * 1992-08-19 1995-05-23 Sandvik Ab Tool comprised of a holder body and a hard insert and method of using same
GB2274474B (en) * 1993-01-21 1996-07-31 Camco Drilling Group Ltd Improvements in or relating to cutter assemblies for rotary drill bits
US5494477A (en) * 1993-08-11 1996-02-27 General Electric Company Abrasive tool insert
US5484330A (en) * 1993-07-21 1996-01-16 General Electric Company Abrasive tool insert
US5486137A (en) * 1993-07-21 1996-01-23 General Electric Company Abrasive tool insert
US5837071A (en) * 1993-11-03 1998-11-17 Sandvik Ab Diamond coated cutting tool insert and method of making same
US5447208A (en) * 1993-11-22 1995-09-05 Baker Hughes Incorporated Superhard cutting element having reduced surface roughness and method of modifying
US5435403A (en) * 1993-12-09 1995-07-25 Baker Hughes Incorporated Cutting elements with enhanced stiffness and arrangements thereof on earth boring drill bits
US5605198A (en) * 1993-12-09 1997-02-25 Baker Hughes Incorporated Stress related placement of engineered superabrasive cutting elements on rotary drag bits
ZA9410016B (en) * 1993-12-21 1995-08-24 De Beers Ind Diamond Tool component
US5492188A (en) * 1994-06-17 1996-02-20 Baker Hughes Incorporated Stress-reduced superhard cutting element
US6514289B1 (en) 2000-01-30 2003-02-04 Diamicron, Inc. Diamond articulation surface for use in a prosthetic joint
US7077867B1 (en) 1994-08-12 2006-07-18 Diamicron, Inc. Prosthetic knee joint having at least one diamond articulation surface
US6596225B1 (en) 2000-01-31 2003-07-22 Diamicron, Inc. Methods for manufacturing a diamond prosthetic joint component
US6800095B1 (en) 1994-08-12 2004-10-05 Diamicron, Inc. Diamond-surfaced femoral head for use in a prosthetic joint
US6494918B1 (en) 2000-01-30 2002-12-17 Diamicron, Inc. Component for a prosthetic joint having a diamond load bearing and articulation surface
US6402787B1 (en) 2000-01-30 2002-06-11 Bill J. Pope Prosthetic hip joint having at least one sintered polycrystalline diamond compact articulation surface and substrate surface topographical features in said polycrystalline diamond compact
EP0707130B1 (en) * 1994-10-15 2003-07-16 Camco Drilling Group Limited Rotary drill bits
US5758733A (en) * 1996-04-17 1998-06-02 Baker Hughes Incorporated Earth-boring bit with super-hard cutting elements
US6068071A (en) * 1996-05-23 2000-05-30 U.S. Synthetic Corporation Cutter with polycrystalline diamond layer and conic section profile
US5711702A (en) * 1996-08-27 1998-01-27 Tempo Technology Corporation Curve cutter with non-planar interface
US6041875A (en) * 1996-12-06 2000-03-28 Smith International, Inc. Non-planar interfaces for cutting elements
US5967249A (en) * 1997-02-03 1999-10-19 Baker Hughes Incorporated Superabrasive cutters with structure aligned to loading and method of drilling
US5871060A (en) * 1997-02-20 1999-02-16 Jensen; Kenneth M. Attachment geometry for non-planar drill inserts
US5979578A (en) 1997-06-05 1999-11-09 Smith International, Inc. Multi-layer, multi-grade multiple cutting surface PDC cutter
US5979579A (en) * 1997-07-11 1999-11-09 U.S. Synthetic Corporation Polycrystalline diamond cutter with enhanced durability
US6315945B1 (en) 1997-07-16 2001-11-13 The Dow Chemical Company Method to form dense complex shaped articles
US5778994A (en) * 1997-07-29 1998-07-14 Dresser Industries, Inc. Claw tooth rotary bit
US6202771B1 (en) 1997-09-23 2001-03-20 Baker Hughes Incorporated Cutting element with controlled superabrasive contact area, drill bits so equipped
US5944129A (en) * 1997-11-28 1999-08-31 U.S. Synthetic Corporation Surface finish for non-planar inserts
US6196340B1 (en) 1997-11-28 2001-03-06 U.S. Synthetic Corporation Surface geometry for non-planar drill inserts
US6199645B1 (en) 1998-02-13 2001-03-13 Smith International, Inc. Engineered enhanced inserts for rock drilling bits
US6202772B1 (en) * 1998-06-24 2001-03-20 Smith International Cutting element with canted design for improved braze contact area
CA2276841C (en) 1998-07-07 2004-12-14 Smith International, Inc. Unplanar non-axisymmetric inserts
US6241036B1 (en) * 1998-09-16 2001-06-05 Baker Hughes Incorporated Reinforced abrasive-impregnated cutting elements, drill bits including same
US6315066B1 (en) * 1998-09-18 2001-11-13 Mahlon Denton Dennis Microwave sintered tungsten carbide insert featuring thermally stable diamond or grit diamond reinforcement
US6436204B1 (en) 1998-11-20 2002-08-20 Kennametal Pc Inc. Diamond coated cutting tools and method of manufacture
US6216805B1 (en) 1999-07-12 2001-04-17 Baker Hughes Incorporated Dual grade carbide substrate for earth-boring drill bit cutting elements, drill bits so equipped, and methods
US6709463B1 (en) 2000-01-30 2004-03-23 Diamicron, Inc. Prosthetic joint component having at least one solid polycrystalline diamond component
US6439327B1 (en) 2000-08-24 2002-08-27 Camco International (Uk) Limited Cutting elements for rotary drill bits
US6550556B2 (en) 2000-12-07 2003-04-22 Smith International, Inc Ultra hard material cutter with shaped cutting surface
US6488106B1 (en) 2001-02-05 2002-12-03 Varel International, Inc. Superabrasive cutting element
US6510910B2 (en) 2001-02-09 2003-01-28 Smith International, Inc. Unplanar non-axisymmetric inserts
US6513608B2 (en) 2001-02-09 2003-02-04 Smith International, Inc. Cutting elements with interface having multiple abutting depressions
EP1488019A1 (en) * 2002-03-28 2004-12-22 Camco International (UK) Limited Polycrystalline material element with improved wear resistance and methods of manufacture thereof
US7234550B2 (en) * 2003-02-12 2007-06-26 Smith International, Inc. Bits and cutting structures
TWI285898B (en) * 2003-04-23 2007-08-21 Winbond Electronics Corp Pumping circuit of memory
US6962218B2 (en) * 2003-06-03 2005-11-08 Smith International, Inc. Cutting elements with improved cutting element interface design and bits incorporating the same
US7625521B2 (en) 2003-06-05 2009-12-01 Smith International, Inc. Bonding of cutters in drill bits
US20040245024A1 (en) * 2003-06-05 2004-12-09 Kembaiyan Kumar T. Bit body formed of multiple matrix materials and method for making the same
US7726420B2 (en) * 2004-04-30 2010-06-01 Smith International, Inc. Cutter having shaped working surface with varying edge chamfer
US20060024140A1 (en) * 2004-07-30 2006-02-02 Wolff Edward C Removable tap chasers and tap systems including the same
US7287610B2 (en) * 2004-09-29 2007-10-30 Smith International, Inc. Cutting elements and bits incorporating the same
US8637127B2 (en) 2005-06-27 2014-01-28 Kennametal Inc. Composite article with coolant channels and tool fabrication method
WO2007089590A2 (en) * 2006-01-26 2007-08-09 University Of Utah Research Foundation Polycrystalline abrasive composite cutter
RU2432445C2 (en) 2006-04-27 2011-10-27 Ти Ди Уай Индастриз, Инк. Modular drill bit with fixed cutting elements, body of this modular drill bit and methods of their manufacturing
JP5330255B2 (en) 2006-10-25 2013-10-30 ティーディーワイ・インダストリーズ・エルエルシー Articles with improved thermal crack resistance
KR100942983B1 (en) * 2007-10-16 2010-02-17 주식회사 하이닉스반도체 Semiconductor device and method for manufacturing the same
US8790439B2 (en) 2008-06-02 2014-07-29 Kennametal Inc. Composite sintered powder metal articles
US8025112B2 (en) 2008-08-22 2011-09-27 Tdy Industries, Inc. Earth-boring bits and other parts including cemented carbide
US8789894B2 (en) * 2009-01-13 2014-07-29 Diamond Innovations, Inc. Radial tool with superhard cutting surface
US8480304B1 (en) * 2009-01-20 2013-07-09 Us Synthetic Corporation Bearings, bearing apparatus, and systems including the same
US8069937B2 (en) * 2009-02-26 2011-12-06 Us Synthetic Corporation Polycrystalline diamond compact including a cemented tungsten carbide substrate that is substantially free of tungsten carbide grains exhibiting abnormal grain growth and applications therefor
US20100242375A1 (en) * 2009-03-30 2010-09-30 Hall David R Double Sintered Thermally Stable Polycrystalline Diamond Cutting Elements
US9050673B2 (en) * 2009-06-19 2015-06-09 Extreme Surface Protection Ltd. Multilayer overlays and methods for applying multilayer overlays
US8887839B2 (en) * 2009-06-25 2014-11-18 Baker Hughes Incorporated Drill bit for use in drilling subterranean formations
RU2012103935A (en) 2009-07-08 2013-08-20 Бейкер Хьюз Инкорпорейтед CUTTING ELEMENT AND METHOD FOR ITS FORMATION
US8978788B2 (en) 2009-07-08 2015-03-17 Baker Hughes Incorporated Cutting element for a drill bit used in drilling subterranean formations
EP2481525A3 (en) 2009-07-27 2013-10-02 Baker Hughes Incorporated Abrasive article
US8191658B2 (en) 2009-08-20 2012-06-05 Baker Hughes Incorporated Cutting elements having different interstitial materials in multi-layer diamond tables, earth-boring tools including such cutting elements, and methods of forming same
US8277722B2 (en) * 2009-09-29 2012-10-02 Baker Hughes Incorporated Production of reduced catalyst PDC via gradient driven reactivity
US9643236B2 (en) 2009-11-11 2017-05-09 Landis Solutions Llc Thread rolling die and method of making same
US20110174549A1 (en) * 2010-01-20 2011-07-21 Gerard Dolan Superhard insert and an earth boring tool comprising same
US9205531B2 (en) 2011-09-16 2015-12-08 Baker Hughes Incorporated Methods of fabricating polycrystalline diamond, and cutting elements and earth-boring tools comprising polycrystalline diamond
US10005672B2 (en) 2010-04-14 2018-06-26 Baker Hughes, A Ge Company, Llc Method of forming particles comprising carbon and articles therefrom
SA111320374B1 (en) 2010-04-14 2015-08-10 بيكر هوغيس انكوبوريتد Method Of Forming Polycrystalline Diamond From Derivatized Nanodiamond
GB2491306B (en) * 2010-06-16 2013-06-12 Element Six Abrasives Sa Superhard cutter
CN103069098A (en) 2010-08-13 2013-04-24 贝克休斯公司 Cutting elements including nanoparticles in at least one portion thereof, earth-boring tools including such cutting elements, and related methods
US9175521B2 (en) * 2010-08-24 2015-11-03 Varel Europe S.A.S. Functionally leached PCD cutter and method for fabricating the same
CN102071877A (en) * 2010-12-30 2011-05-25 西南石油大学 Polycrystalline diamond compact
US8807247B2 (en) 2011-06-21 2014-08-19 Baker Hughes Incorporated Cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and methods of forming such cutting elements for earth-boring tools
US8800848B2 (en) 2011-08-31 2014-08-12 Kennametal Inc. Methods of forming wear resistant layers on metallic surfaces
SG11201400649XA (en) 2011-09-16 2014-04-28 Baker Hughes Inc Methods of fabricating polycrystalline diamond, and cutting elements and earth-boring tools comprising polycrystalline diamond
US9016406B2 (en) 2011-09-22 2015-04-28 Kennametal Inc. Cutting inserts for earth-boring bits
US9234391B2 (en) 2011-11-29 2016-01-12 Smith International, Inc. Shear cutter with improved wear resistance of WC-CO substrate
US20130182982A1 (en) 2012-01-17 2013-07-18 Dennis Tool Company Carbide wear surface and method of manufacture
US9066462B2 (en) 2012-05-03 2015-06-30 Atom Jet Industries (2002) Ltd. Working tools with wear resistant working surfaces for agricultural implements and other applications
US20140175853A1 (en) * 2012-12-20 2014-06-26 Esco Hydra (Uk) Limited Pick For Earthworking Machine
US9140072B2 (en) 2013-02-28 2015-09-22 Baker Hughes Incorporated Cutting elements including non-planar interfaces, earth-boring tools including such cutting elements, and methods of forming cutting elements
GB201305873D0 (en) * 2013-03-31 2013-05-15 Element Six Abrasives Sa Superhard constructions & method of making same
US10307891B2 (en) 2015-08-12 2019-06-04 Us Synthetic Corporation Attack inserts with differing surface finishes, assemblies, systems including same, and related methods
US10933511B2 (en) 2015-12-27 2021-03-02 Schlumberger Technology Corporation Polycrystalline diamond constructions with modified reaction zone
US10900291B2 (en) 2017-09-18 2021-01-26 Us Synthetic Corporation Polycrystalline diamond elements and systems and methods for fabricating the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592433A (en) * 1984-10-04 1986-06-03 Strata Bit Corporation Cutting blank with diamond strips in grooves
EP0235455A2 (en) * 1986-02-13 1987-09-09 Smith International, Inc. Percussion rock bit
US4743515A (en) * 1984-11-13 1988-05-10 Santrade Limited Cemented carbide body used preferably for rock drilling and mineral cutting
US4766040A (en) * 1987-06-26 1988-08-23 Sandvik Aktiebolag Temperature resistant abrasive polycrystalline diamond bodies
US4784023A (en) * 1985-12-05 1988-11-15 Diamant Boart-Stratabit (Usa) Inc. Cutting element having composite formed of cemented carbide substrate and diamond layer and method of making same
EP0356097A2 (en) * 1988-08-15 1990-02-28 De Beers Industrial Diamond Division (Proprietary) Limited Tool insert

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941248A (en) * 1958-01-06 1960-06-21 Gen Electric High temperature high pressure apparatus
US3141746A (en) * 1960-10-03 1964-07-21 Gen Electric Diamond compact abrasive
US3757879A (en) * 1972-08-24 1973-09-11 Christensen Diamond Prod Co Drill bits and methods of producing drill bits
US3757878A (en) * 1972-08-24 1973-09-11 Christensen Diamond Prod Co Drill bits and method of producing drill bits
US4109737A (en) * 1976-06-24 1978-08-29 General Electric Company Rotary drill bit
US4148368A (en) * 1976-09-27 1979-04-10 Smith International, Inc. Rock bit with wear resistant inserts
US4531595A (en) * 1979-01-08 1985-07-30 Housman Robert J Wear resistant composite insert and boring tool with insert
US4274840A (en) * 1979-01-08 1981-06-23 Smith International, Inc Wear resistant composite insert, boring tool using such insert, and method for making the insert
GB2138864B (en) * 1983-04-28 1986-07-30 Sumitomo Metal Mining Co Roller drill bits
US4593776A (en) * 1984-03-28 1986-06-10 Smith International, Inc. Rock bits having metallurgically bonded cutter inserts
SE442305B (en) * 1984-06-27 1985-12-16 Santrade Ltd PROCEDURE FOR CHEMICAL GAS DEPOSITION (CVD) FOR THE PREPARATION OF A DIAMOND COATED COMPOSITION BODY AND USE OF THE BODY
GB8418481D0 (en) * 1984-07-19 1984-08-22 Nl Petroleum Prod Rotary drill bits
US4889017A (en) * 1984-07-19 1989-12-26 Reed Tool Co., Ltd. Rotary drill bit for use in drilling holes in subsurface earth formations
US4751972A (en) * 1986-03-13 1988-06-21 Smith International, Inc. Revolving cutters for rock bits
SE456428B (en) * 1986-05-12 1988-10-03 Santrade Ltd HARD METAL BODY FOR MOUNTAIN DRILLING WITH BINDING PHASE GRADIENT AND WANTED TO MAKE IT SAME
SE453202B (en) * 1986-05-12 1988-01-18 Sandvik Ab SINTER BODY FOR CUTTING PROCESSING
US4731296A (en) * 1986-07-03 1988-03-15 Mitsubishi Kinzoku Kabushiki Kaisha Diamond-coated tungsten carbide-base sintered hard alloy material for insert of a cutting tool
US4871377A (en) * 1986-07-30 1989-10-03 Frushour Robert H Composite abrasive compact having high thermal stability and transverse rupture strength
ZA877921B (en) * 1986-12-22 1988-04-21 General Electric Company Condensate diamond
US4764434A (en) * 1987-06-26 1988-08-16 Sandvik Aktiebolag Diamond tools for rock drilling and machining
CA1331520C (en) * 1987-10-12 1994-08-23 De Beers Industrial Diamond Division (Proprietary) Abrasive products
IE61697B1 (en) * 1987-12-22 1994-11-16 De Beers Ind Diamond Abrasive product
US4819516A (en) * 1988-01-07 1989-04-11 Diamant Boart-Stratabit (Usa) Inc. Method of forming a cutting element having a V-shaped diamond cutting face
US4811801A (en) * 1988-03-16 1989-03-14 Smith International, Inc. Rock bits and inserts therefor
US4858707A (en) * 1988-07-19 1989-08-22 Smith International, Inc. Convex shaped diamond cutting elements
US5074623A (en) * 1989-04-24 1991-12-24 Sandvik Ab Tool for cutting solid material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592433A (en) * 1984-10-04 1986-06-03 Strata Bit Corporation Cutting blank with diamond strips in grooves
US4743515A (en) * 1984-11-13 1988-05-10 Santrade Limited Cemented carbide body used preferably for rock drilling and mineral cutting
US4784023A (en) * 1985-12-05 1988-11-15 Diamant Boart-Stratabit (Usa) Inc. Cutting element having composite formed of cemented carbide substrate and diamond layer and method of making same
EP0235455A2 (en) * 1986-02-13 1987-09-09 Smith International, Inc. Percussion rock bit
US4766040A (en) * 1987-06-26 1988-08-23 Sandvik Aktiebolag Temperature resistant abrasive polycrystalline diamond bodies
EP0356097A2 (en) * 1988-08-15 1990-02-28 De Beers Industrial Diamond Division (Proprietary) Limited Tool insert

Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413869A (en) * 1991-11-13 1995-05-09 Sandvik Ab Cemented carbide body with increased wear resistance
EP0542704A1 (en) * 1991-11-13 1993-05-19 Sandvik Aktiebolag Cemented carbide body with increased wear resistance
GB2261894A (en) * 1991-11-30 1993-06-02 Camco Drilling Group Ltd Improvements in or relating to cutting elements for rotary drill bits
GB2261894B (en) * 1991-11-30 1995-07-05 Camco Drilling Group Ltd Improvements in or relating to cutting elements for rotary drill bits
EP0592210A2 (en) * 1992-10-07 1994-04-13 Camco Drilling Group Limited Cutting element for rotary drag drillbit
EP0592210A3 (en) * 1992-10-07 1995-03-15 Camco Drilling Group Ltd Cutting element for rotary drag drillbit.
US5469927A (en) * 1992-12-10 1995-11-28 Camco International Inc. Cutting elements for rotary drill bits
EP0601840A1 (en) * 1992-12-10 1994-06-15 Camco Drilling Group Limited Improvements in or relating to cutting elements for rotary drill bits
EP0604211A1 (en) * 1992-12-23 1994-06-29 De Beers Industrial Diamond Division (Proprietary) Limited Composite tool for drilling bits
GB2275068A (en) * 1993-02-10 1994-08-17 Baker Hughes Inc Polycrystalline diamond cutting element
BE1010218A5 (en) * 1993-02-10 1998-04-07 Baker Hughes Inc Element polycrystalline diamond cutting.
GB2281087A (en) * 1993-08-17 1995-02-22 Dennis Mahlon Denton Cutting element for drill bits
GB2281087B (en) * 1993-08-17 1997-07-30 Dennis Mahlon Denton Cutting element for drill bits
US5598750A (en) * 1993-11-10 1997-02-04 Camco Drilling Group Limited Elements faced with superhard material
EP0655548A1 (en) * 1993-11-10 1995-05-31 Camco Drilling Group Limited Improvements in or relating to cutting elements for rotary drill bits
EP0692607A3 (en) * 1994-06-16 1997-09-10 De Beers Ind Diamond Tool component with abrasive compact
EP0716215A3 (en) * 1994-12-09 1998-03-18 Baker Hughes Incorporated Superhard cutting structures for earth boring with enhanced stiffness and heat transfer capabilities
US5906246A (en) * 1996-06-13 1999-05-25 Smith International, Inc. PDC cutter element having improved substrate configuration
US6148937A (en) * 1996-06-13 2000-11-21 Smith International, Inc. PDC cutter element having improved substrate configuration
GB2316698A (en) * 1996-08-26 1998-03-04 Smith International PDC compact for cutter element having contoured substrate interface
GB2316698B (en) * 1996-08-26 2000-10-18 Smith International PDC cutter element having improved substrate configuration
US6325165B1 (en) * 1998-03-06 2001-12-04 Smith International, Inc. Cutting element with improved polycrystalline material toughness
US6446740B2 (en) 1998-03-06 2002-09-10 Smith International, Inc. Cutting element with improved polycrystalline material toughness and method for making same
EP0989282A2 (en) * 1998-09-24 2000-03-29 Camco International (UK) Limited Improvements in preform cutting elements for rotary drag-type drill bits
EP0989282A3 (en) * 1998-09-24 2002-01-30 Camco International (UK) Limited Improvements in preform cutting elements for rotary drag-type drill bits
US6435058B1 (en) 2000-09-20 2002-08-20 Camco International (Uk) Limited Rotary drill bit design method
US6481511B2 (en) 2000-09-20 2002-11-19 Camco International (U.K.) Limited Rotary drill bit
US6601662B2 (en) 2000-09-20 2003-08-05 Grant Prideco, L.P. Polycrystalline diamond cutters with working surfaces having varied wear resistance while maintaining impact strength
WO2004040095A1 (en) * 2002-10-30 2004-05-13 Element Six (Proprietary) Limited Tool insert
US7594553B2 (en) * 2002-10-30 2009-09-29 Klaus Tank Composite tool insert
WO2007069029A1 (en) * 2005-12-12 2007-06-21 Element Six (Production) (Pty) Ltd Pcbn cutting tool components
US8461832B2 (en) 2008-10-03 2013-06-11 Us Synthetic Corporation Method of characterizing a polycrystalline diamond element by at least one magnetic measurement
US8616306B2 (en) 2008-10-03 2013-12-31 Us Synthetic Corporation Polycrystalline diamond compacts, method of fabricating same, and various applications
US8158258B2 (en) 2008-10-03 2012-04-17 Us Synthetic Corporation Polycrystalline diamond
US10703681B2 (en) 2008-10-03 2020-07-07 Us Synthetic Corporation Polycrystalline diamond compacts
US8297382B2 (en) 2008-10-03 2012-10-30 Us Synthetic Corporation Polycrystalline diamond compacts, method of fabricating same, and various applications
US10961785B2 (en) 2008-10-03 2021-03-30 Us Synthetic Corporation Polycrystalline diamond compact
US9134275B2 (en) 2008-10-03 2015-09-15 Us Synthetic Corporation Polycrystalline diamond compact and method of fabricating same
US8020645B2 (en) 2008-10-03 2011-09-20 Us Synthetic Corporation Method of fabricating polycrystalline diamond and a polycrystalline diamond compact
US10508502B2 (en) 2008-10-03 2019-12-17 Us Synthetic Corporation Polycrystalline diamond compact
US10507565B2 (en) 2008-10-03 2019-12-17 Us Synthetic Corporation Polycrystalline diamond, polycrystalline diamond compacts, methods of making same, and applications
US8766628B2 (en) 2008-10-03 2014-07-01 Us Synthetic Corporation Methods of characterizing a component of a polycrystalline diamond compact by at least one magnetic measurement
US10287822B2 (en) 2008-10-03 2019-05-14 Us Synthetic Corporation Methods of fabricating a polycrystalline diamond compact
US9932274B2 (en) 2008-10-03 2018-04-03 Us Synthetic Corporation Polycrystalline diamond compacts
US9459236B2 (en) 2008-10-03 2016-10-04 Us Synthetic Corporation Polycrystalline diamond compact
US9315881B2 (en) 2008-10-03 2016-04-19 Us Synthetic Corporation Polycrystalline diamond, polycrystalline diamond compacts, methods of making same, and applications
EP2508636A3 (en) * 2010-01-21 2012-12-26 US Synthetic Corporation Polycrystalline diamond compacts, method of fabricating same, and various application
CN102712970B (en) * 2010-01-21 2015-09-16 美国合成公司 Polycrystalline diamond compacts (PDCs), its manufacture method and various application
CN102712970A (en) * 2010-01-21 2012-10-03 美国合成公司 Polycrystalline diamond compacts, method of fabricating same, and various applications
WO2011090582A1 (en) * 2010-01-21 2011-07-28 Us Synthetic Corporation Polycrystalline diamond compacts, method of fabricating same, and various applications
US10350730B2 (en) 2011-04-15 2019-07-16 Us Synthetic Corporation Polycrystalline diamond compacts including at least one transition layer and methods for stress management in polycrystalline diamond compacts
US8727046B2 (en) 2011-04-15 2014-05-20 Us Synthetic Corporation Polycrystalline diamond compacts including at least one transition layer and methods for stress management in polycrsystalline diamond compacts
US8858665B2 (en) 2011-04-28 2014-10-14 Robert Frushour Method for making fine diamond PDC
US8741010B2 (en) 2011-04-28 2014-06-03 Robert Frushour Method for making low stress PDC
US8974559B2 (en) 2011-05-12 2015-03-10 Robert Frushour PDC made with low melting point catalyst
US9061264B2 (en) 2011-05-19 2015-06-23 Robert H. Frushour High abrasion low stress PDC
US8828110B2 (en) 2011-05-20 2014-09-09 Robert Frushour ADNR composite
US9428967B2 (en) 2013-03-01 2016-08-30 Baker Hughes Incorporated Polycrystalline compact tables for cutting elements and methods of fabrication
US10094173B2 (en) 2013-03-01 2018-10-09 Baker Hughes Incorporated Polycrystalline compacts for cutting elements, related earth-boring tools, and related methods

Also Published As

Publication number Publication date
EP0462955B1 (en) 1995-12-27
IE912036A1 (en) 1991-12-18
IE71946B1 (en) 1997-03-12
NO912306L (en) 1991-12-16
DE69115766T2 (en) 1996-05-23
NO912306D0 (en) 1991-06-14
SE9002137D0 (en) 1990-06-15
US5217081A (en) 1993-06-08
ZA914394B (en) 1992-08-26
NO180691C (en) 1997-06-04
NO180691B (en) 1997-02-17
DE69115766D1 (en) 1996-02-08

Similar Documents

Publication Publication Date Title
EP0462955B1 (en) Improved tools for cutting rock drilling
EP0462091B1 (en) Improved tools for percussive and rotary crushing rock drilling provided with a diamond layer
US5154245A (en) Diamond rock tools for percussive and rotary crushing rock drilling
US5496638A (en) Diamond tools for rock drilling, metal cutting and wear part applications
US6841260B2 (en) Composite constructions with oriented microstructure
AU2002212567B2 (en) A method of making a composite abrasive compact
US7211218B2 (en) Polycrystalline diamond carbide composites
EP0169081B1 (en) Composite polycristalline diamond
US8240405B2 (en) Polycrystalline diamond abrasive elements
AU2002212567A1 (en) A method of making a composite abrasive compact
EP0941791A2 (en) Abrasive body
GB2398797A (en) Composite material

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE DK ES FR GB IT SE

17P Request for examination filed

Effective date: 19920302

17Q First examination report despatched

Effective date: 19930609

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE DK ES FR GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19951227

Ref country code: DK

Effective date: 19951227

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO MILANO S.P.A.

REF Corresponds to:

Ref document number: 69115766

Country of ref document: DE

Date of ref document: 19960208

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20010605

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20010606

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20010611

Year of fee payment: 11

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20020611

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020612

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20020827

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20020612

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030613

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030630

BERE Be: lapsed

Owner name: S.A. *DIAMANT BOART STRATABIT

Effective date: 20030630

Owner name: *SANDVIK A.B.

Effective date: 20030630

EUG Se: european patent has lapsed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050612